package com.example.blank.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import com.example.blank.Dao.StudentDao;

public class GetAllCourseServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public GetAllCourseServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		StudentDao.testSQL(request, response);
		ArrayList<HashMap<String,Object>> list = StudentDao.getAllCourse();
	
		JSONArray jsonArray = new JSONArray();
//		StudentDao.testSQL(request, response);
		
		 
		if(list==null)
		{
			response.getWriter().write("null");
			return;
		}
		for(HashMap map : list)
		{
			JSONObject object = new JSONObject();
			object.put("course_id", (String)map.get("course_id"));
			object.put("course_name", (String)map.get("course_name"));
			object.put("teacher_id", (String)map.get("teacher_id"));
			jsonArray.add(object);
			
		}
		
		response.getWriter().write(jsonArray.toString());
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
